public HashedSet <T> UnionWith(params ICollection <T>[] sets)
{
var result = new HashedSet <T>();
foreach (var item in this)
{
if (!result.Contains(item))
{
result.Add(item);
}
}
foreach (var set in sets)
{
foreach (var item in set)
{
if (!result.Contains(item))
{
result.Add(item);
}
}
}
return(result);
}
public HashedSet <T> UnionWith(IEnumerable <T> otherSet)
{
var result = new HashedSet <T>();
foreach (var item in this)
{
if (!result.Contains(item))
{
result.Add(item);
}
}
foreach (var item in otherSet)
{
if (!result.Contains(item))
{
result.Add(item);
}
}
return(result);
}